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Tunning the tilt of the Dirac cone by atomic manipulations in 8Pmmn borophene

Yekta, Yasin, Hadipour, Hanif, Jafari, Seyed Akbar (2023) Tunning the tilt of the Dirac cone by atomic manipulations in 8Pmmn borophene. Communications Physics, 6 (1). Article Number 46. ISSN 2399-3650. (doi:10.1038/s42005-023-01161-9) (KAR id:100490)


Two dimensional quantum materials possessing Dirac cones in their spectrum are fascinating due to their emergent low-energy Dirac fermions. In 8Pmmn borophene the Dirac cone is furthermore tilted, which is a proxy for spacetime geometry, since the future light-cone depends on the underlying metric. Therefore it is important to understand the microscopic origin of the tilt. Here, based on ab-initio calculations, we decipher the atomistic mechanism of the formation of tilt. First, nearest-neighbor hopping on a buckled honeycomb lattice forms an upright Dirac cone. Then, the difference in the renormalized anisotropic second-neighbor hopping, formed by virtual hoppings on one-dimensional chains of atoms, tilts the Dirac cone. We construct an accurate tight-binding model on honeycomb graph for analytical investigation, and we find that substitution of certain boron atoms by carbon provides a way to change the tilt of the cone.

Item Type: Article
DOI/Identification number: 10.1038/s42005-023-01161-9
Subjects: Q Science
Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
SWORD Depositor: JISC Publications Router
Depositing User: JISC Publications Router
Date Deposited: 18 Apr 2023 13:02 UTC
Last Modified: 19 Apr 2023 11:11 UTC
Resource URI: (The current URI for this page, for reference purposes)

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